If \( x=a \sec ^{3} \theta \) and \( y=a \tan ^{3} \theta \), find ...
If \( x=a \sec ^{3} \theta \) and \( y=a \tan ^{3} \theta \), find \( \frac{d y}{d x} \) at \( \frac{\pi}{6} \).
\( \mathrm{P} \)
W
(1) \( \frac{1}{2} \)
(2) \( \frac{-1}{2} \)
(3) \( \frac{\sqrt{3}}{2} \)
(4) \( \frac{-\sqrt{3}}{2} \)
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